<template>
  <div id="app">
    <Nav></Nav>
    <router-view/>
    <Footer></Footer>
  </div>
</template>

<script>
  import Nav from './components/Nav/Nav.vue'
  import Footer from './components/Footer/Footer.vue'
export default {
  name: 'App',
  components:{
    Nav,
    Footer
  },created(){
    //在页面刷新时将vuex里的信息保存到sessionStorage里
    window.addEventListener("beforeunload",()=>{
      sessionStorage.setItem("store",JSON.stringify(this.$store.state))
    })
    //在页面加载时读取sessionStorage里的状态信息
    if (sessionStorage.getItem("store") ) {
      this.$store.replaceState(Object.assign({}, this.$store.state,JSON.parse(sessionStorage.getItem("store"))))
    }
  }
}
</script>

<style>
</style>
